iDrive, Backblaze and Carbonite are great cloud options for backing up your Mac.Backing up your Mac ensures you don’t lose your files.Should damage or malfunction arise, it’s important to know how to backup a Mac to an external hard drive to ensure you can keep all your files. However, more important than the laptop itself are the contents that exist on it. Millions of people flock to buy a Mac because of its beautiful design and superb operating system. MP4 Repair: How to Fix Corrupted Video Files in 2019.